Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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The present invention relates to the field of electrical
apparatus. In particular, the present invention provides a novel
surface mounted junction box for use in mounting electrical
outlets or fixtures to wall surfaces.
When a building is wired for the provision of electrical
power therein, the wiring is installed between the exterior and
interior wall surfaces, beneath floors, above ceilings and
between the surfaces in interior walls. Installation of wiring
is carried out aEter framing, and before walls are installed on
both sides o~ erected framing. At those points where it is
desired to provide an electrical receptacle, wiring for ceiling
lighting, or the like, a junction box, usually made from steel,
is securely Eastened to a frame member, and connected to the
wiring~ When wall surfaces, e.g., drywall, is later installed,
appropriate apertures are cut to provide access to the junction
boxe~. This type of installation is well suited to applications
such as new home construction or extensive renovation lnvolving
demolition and reconstruction of walls. In both of those
situations, there i6 easy access to thl~ interior spaces of walls.
However, where it is desired to install an outlet or
lighting fixture on a finished wall, it has been necessary to cut
a large hole in the wall, install the junction box on a framing
member, and then repair the wall around the area of installation.
It will be appreciated that this is a time consuming operation,
and requires considerable skill to achieve an acceptable result.
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Also, even in new construction, in those situations where a
finishing surface of a wall is thick or difficult to work with,
as for instance a ~rick wall, it is often difficult to
conveniently mount a receptacle to a wall while achieving an
acceptable finished appearance. In the case of a brick wall,
there is often too much depth between the exterior of the wall
and the interior frame to mount a box on the frame and access it
on the exterior.
The ob~ect of the present invention is to provide an
lQ electrical junction box that may be mounted on a wall surface
without the need of accessing the internal framing thereof. A
further object of the present invention is to provide a junction
box that may easily be attached to a thick or hard wall such as
a brick or masonry wall to provide an electrical receptacle,
light mixture mount or the like thereon.
In a broad aspect, the present invention relates to a
junction box for connection to the electrical wiring o~ a
building structure including: (i) an inner panel adapted for
mounting to a surface of a building structure; (ii) an outer
panel substantially parallel to and spaced from said inner panel
and adapted for mounting an electrical device thereon; (iii) side
panel means bridging said inner and outer panels to provide an
enclosure therebetween; said innèr panel being adapted to permit
passage of an electrical conduit therethrough, and said outer
panel being adapted to permit access to said electrical conduit
for connection of an electrical devi~e thereto.
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In drawings which illustrate the present invention by way
of example:
Figure 1 is a front view of a fixture box according to the
present invenkion;
Figure 2 is a view through line II-II of Figure 1:
Figure 3 is a view through line III-III of Figure l;
Figure 4 is a front view of an outlet box according to the
present invention;
Fi~ure 5 is a view through line V-V of Figure 4;
Figure 6 is a view through line VI-VI of Figure 4;
Referring now to Figures 1, 2 and 3, a hollow fixture box
B according to the present invention has a flat rear surface 7
for mounting directly against a wall surface. A pair of key-
hole apertures 4 are formed in the rear surface of the box, for
removable attachment of the box to a surface by screws which may
be screwed into framing studs or anchors in a wall or ceiling.
Holes 4 are accessi~le from the front o~ the box for tightening
of the said screws by provision of a large generally circular
aperture in the front surface 9 of the box. This aperture also
~o provides access to wiring within the box. The front and rear
surfaces of the box are joined by side panels 13, which form an
enclosure to accommodate access cable and cable connections etc.
Cable is led into and exits the box at knock-out~ 10 which
are provided at the top and ~ottom of the box. Adjacent cable
entry knock-outs 10, clamps 1 are provided on clamp mount6 B
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which are raised from the interior of the box. Cable which is
led into the box is slipped under clamps 1, and then screw ll is
tightened into clap mount 8 to secure the wire in place. Clamp
screw ll also functions as a ground screw. Additional ground
screws 2 are located on raised portions of the rear surface of
the box, as can be seen ~rom Figures l and 3O It will be
appreciated, then, that a metal plate will connect ground screws
2 and 11 if the box of the present invention is fabricated from
plastic. In khis regard, it will be understood that the box of
the present invention may be fabricated from any suitable
material, which will be a matter of choice for one skilled in the
art.
Additional screw holes 3 are provided for increased
flexibility in mounting the box of the present invention.
Moreover, an additional cable knock out 6 is pro~ided so that
additional cable may be led into the box.
On the front surface of the box, fixture bar hanger holes
5 are provided so that a standard light fixture bar h~nger may
easily be attached to the box of the present invention.
20Between the front and rear surfaces of the box there is a
hollow space to accommodate cable and wiring.
To install the box of the present invention, one need only
lead a cable through a wall, without the necessity of cutting a
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hole in a wall for mounting a box therein. The appropriate cable
knock out is removed, and the cable led into the box and clamped
into place. The ground wire of the cable is screwed to a qround
connection 8, 2, in the box. The box is then securely fastened
by screws to the outer surface of the wall, and it is ready for
use. It will be appreciated that in the case of a brick or
masonry wall, installation requires only that a cable hole and
anchor holes be drilled through the wall. Extensive masonry
work is not re~uired to set the box in place. It is, however,
recommended to caulk around the installed box.
Referring now to the remainder of the figures, an outlet box
is shown. The structures and principles of it are substantially
as described abo~e. The only difference bein~ the size and shape
thereof, and the provision of an addit:ional access aperture 13
at the top and bottom of the box for accessing clamp screws 8.
As well, bar hanger screw holes are replaced with receptacle
atta~hment screw holes 12. Mounting holes 4 are not provided,
mounting being done via holes 3.
It will be appreciated that access apertures 13 will be
covered by a receptacle plate after a receptacle has been
installed in the box.
It is to be understood that the examples described above are
not meant to limit the scope of the present invention. It is
expected that numerous vari~nts will be obvious to the person
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slcilled in the electrical wiring apparatus design field, without
any departure from the spirit of the present invention. The
appended claims, properly construed, form the only limitation
upon the scope of the present invention.
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